import router, { asyncRouterMap, constantRouterMap } from '../../routers'

// 通过meta.role判断是否与当前用户权限匹配
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return roles.indexOf(route.meta.roles) !== -1
  }
  return true
}

// 递归过滤异步路由表，返回符合用户角色权限的路由表
function filterAsyncRouter(routes, roles) {
  const res = []
  routes.forEach(route => {
    const tmp = { ...route }
    if (hasPermission(roles, tmp)) {
      if (tmp.children) {
        tmp.children = filterAsyncRouter(tmp.children, roles)
      }
      res.push(tmp)
    }
  })

  return res
}

// 初始化路由属性
function initRouter() {
  if (process.env.VUE_APP_PERMISSION_FLAG === 'true') return []
  asyncRouterMap.forEach(el => {
    router.addRoute(el)
  })
  return [...constantRouterMap, ...asyncRouterMap]
}

const permission = {
  state: {
    routers: initRouter(),
    addRouters: []
  },
  mutations: {
    SET_ROUTERS: (state, routers) => {
      state.addRouters = routers
      state.routers = constantRouterMap.concat(routers)
    }
  },
  actions: {
    GenerateRoutes({ commit }, data) {
      const roles = data
      return new Promise(resolve => {
        let accessedRouters
        if (roles.includes('admin')) {
          accessedRouters = asyncRouterMap
        } else {
          accessedRouters = filterAsyncRouter(asyncRouterMap, roles)
        }
        commit('SET_ROUTERS', accessedRouters)
        resolve()
      })
    }
  }
}

export default permission
